If you don’t want to splurge on security alarms but still fear intruders then this DIY is perfect for you. The 15 minutes SMS door entry alarm DIY tells you how to build a cheap alarm system that will notify you on your mobile by SMS in case of a break in.
step 1What you’ll need
An old mobile phone set with supply (charger).
Cheap door magnetic alarm (can be replaced by a magnetic switch and a magnet ).
5 volts Relay.
Soldering iron.
wires and thin insulated copper wires.
micro driller.
micro screwdriver set.
clipper.
multimeter.
Scotch tape.
Read the rest of instructions here.
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